0
0

Delete article

Deleted articles cannot be recovered.

Draft of this article would be also deleted.

Are you sure you want to delete this article?

More than 1 year has passed since last update.

ネットワーク構築 #6(EIGRP設定&ルート再配送)

Last updated at Posted at 2022-08-07

今回の内容

OSPFのルーティング環境下にEIGRPのルーティングプロトコルを追加して、
ルート再配布とLSAタイプの動きを確認します。

実施日:2022/08/06~2022/08/07

状態

ネットワーク構築 #5の状態からR5を追加してR4とR5をEIGRPで接続します。
以下がその図面になります。
image.png

設定

R4

R4#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
R4(config)#router eigrp 1
R4(config-router)#network 192.168.5.254 0.0.0.0
R4(config-router)#exit

R5

R5(config)#router eigrp 1
R5(config-router)#network 192.168.5.253 0.0.0.0
R5(config-router)#exit  

状態確認

R4
R5未設定時の状態

R4(config)#do sh ip eigrp interfaces
EIGRP-IPv4 Interfaces for AS(1)
                        Xmit Queue   Mean   Pacing Time   Multicast    Pending
Interface        Peers  Un/Reliable  SRTT   Un/Reliable   Flow Timer   Routes
Fa1                0        0/0         0       0/1            0           0

R5設定時の状態

R4(config)#do sh ip eigrp interfaces
EIGRP-IPv4 Interfaces for AS(1)
                        Xmit Queue   Mean   Pacing Time   Multicast    Pending
Interface        Peers  Un/Reliable  SRTT   Un/Reliable   Flow Timer   Routes
Fa1                1        0/0         0       0/1            0           0

R4#sh ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is 192.168.4.254 to network 0.0.0.0

O*E2  0.0.0.0/0 [110/1] via 192.168.4.254, 00:36:55, FastEthernet0
      4.0.0.0/32 is subnetted, 1 subnets
C        4.4.4.4 is directly connected, Loopback0
O IA  192.168.1.0/24 [110/4] via 192.168.4.254, 00:37:00, FastEthernet0
O IA  192.168.2.0/24 [110/3] via 192.168.4.254, 00:37:15, FastEthernet0
O IA  192.168.3.0/24 [110/2] via 192.168.4.254, 00:37:26, FastEthernet0
      192.168.4.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.4.0/24 is directly connected, FastEthernet0
L        192.168.4.253/32 is directly connected, FastEthernet0
      192.168.5.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.5.0/24 is directly connected, FastEthernet1
L        192.168.5.254/32 is directly connected, FastEthernet1

R5

R5(config)#do sh ip eigrp interfaces
EIGRP-IPv4 Interfaces for AS(1)
                        Xmit Queue   Mean   Pacing Time   Multicast    Pending
Interface        Peers  Un/Reliable  SRTT   Un/Reliable   Flow Timer   Routes
Fa0                1        0/0      1996       0/1            0           0

R5#sh ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is not set

      192.168.5.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.5.0/24 is directly connected, FastEthernet0
L        192.168.5.253/32 is directly connected, FastEthernet0

R4とR5のみの接続状態のため、EIGRPのプロトコルである「D」の表示がありません。
R5はEIGRPであるため、OSPFのルートを学習出来ていません。
ルート再配送という設定をして、R5にOSPFのルートを学習させます。

ルート再配送設定

R4が学習しているルートをR5に学習させます。
気になる点
192.168.X.X/24のルートをEIGRPに学習させますが、クラスフルでルート集約してしまうのか。

R4の設定
EIGRPのルートを学習させるための設定

R4#router eigrp 1
R4(config-router)#redistribute ospf 1
R4(config-router)#default-metric 100000 1 255 1 1500
R4(config-router)#exit
R4(config)#exit

OSPFのルートを学習させるための設定

R4(config)#router ospf 1
R4(config-router)#redistribute eigrp 1 subnets
R4(config-router)#default-metric 1
R4(config-router)#exit

設定が済んだため、R5のルーティングテーブルを確認してみます。

R5#sh ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is 192.168.5.254 to network 0.0.0.0

D*EX  0.0.0.0/0 [170/28416] via 192.168.5.254, 00:11:18, FastEthernet0
D EX  192.168.1.0/24 [170/28416] via 192.168.5.254, 00:11:18, FastEthernet0
D EX  192.168.2.0/24 [170/28416] via 192.168.5.254, 00:11:18, FastEthernet0
D EX  192.168.3.0/24 [170/28416] via 192.168.5.254, 00:11:18, FastEthernet0
D EX  192.168.4.0/24 [170/28416] via 192.168.5.254, 00:11:18, FastEthernet0
      192.168.5.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.5.0/24 is directly connected, FastEthernet0
L        192.168.5.253/32 is directly connected, FastEthernet0

R5#ping 8.8.8.8
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 8.8.8.8, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/105/504 ms

EIGRPが外部ルートとして、192.168.1.0/24から192.168.4.0/24を学習しています。
気になっていたルート集約もEIGRPに学習させる際のコマンドに[subnets]をオプションで含めたためクラスレスルーティングで学習しました。
Google(8.8.8.8)へのpingも疎通が出来ています。

隣接していないルーターからR5のルートが見えているか確認します。

R1#sh ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is 192.168.1.1 to network 0.0.0.0

S*    0.0.0.0/0 [1/0] via 192.168.1.1
      1.0.0.0/32 is subnetted, 1 subnets
C        1.1.1.1 is directly connected, Loopback0
      192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.1.0/24 is directly connected, FastEthernet0
L        192.168.1.254/32 is directly connected, FastEthernet0
      192.168.2.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.2.0/24 is directly connected, FastEthernet1
L        192.168.2.254/32 is directly connected, FastEthernet1
O IA  192.168.3.0/24 [110/2] via 192.168.2.253, 01:40:54, FastEthernet1
O IA  192.168.4.0/24 [110/3] via 192.168.2.253, 01:40:39, FastEthernet1
O E2  192.168.5.0/24 [110/1] via 192.168.2.253, 00:26:06, FastEthernet1

R5へのルートも学習していることが確認出来ました。

本日はここまで。

0
0
0

Register as a new user and use Qiita more conveniently

  1. You get articles that match your needs
  2. You can efficiently read back useful information
  3. You can use dark theme
What you can do with signing up
0
0

Delete article

Deleted articles cannot be recovered.

Draft of this article would be also deleted.

Are you sure you want to delete this article?